I use only the finest blend of coffee beans which I gather on backpacking trips around the globe. I roast my own beans on the trail and use the roasted beans within 5 days. I then grind my own beans and brew the coffee within 15 minutes of grinding, using fresh spring water with all the various parasites and other microbes lightly killed, by the combined action of the boiling the water and the natural antimicrobial qualties of the coffee beans.
Then I toss the swill into the ditch make cowboy coffee.